In Simulation vs. Narrative: Introduction to ludology Gonzalo Frasca defines ludology:

"Ludology can be defined as a discipline that studies games in general, and videogames in particular."

I agree to the first part, that indeed ludology is the study of games in general. But I must disagree on the last part. Ludology as such does not have a particular focus on computer games. Instead the study of computer games is a special case of ludology. Ludology might as well look into any other kind of games such as roleplaying games, sports, children's games etc.

Actually, ludology is an overall approach to the study of games that combines several disciplines from mathematical game theory to anthropological play theory.